Eccentricity measuring instrument of polygon-mirror motor

Details Eccentricity measuring instrument of polygon-mirror motor Eccentricity measuring instrument of polygon-mirror motor

2007-03-20

2007-03-20

Pham, Hoa Q. (Department: 2877)

Optics: measuring and testing

Position or displacement

Position transverse to viewing axis

Reexamination Certificate

active

11224020

ABSTRACT:
An eccentricity measuring instrument of polygon mirror motors includes a first light source, an optical position detecting element for detecting a position of first reflection light, i.e. first measuring light emitted from the first light source and reflected on the polygon mirror, a second light source, a photo detecting element for detecting a position of second reflection light, i.e. second measuring light emitted from the second light source and reflected on the polygon mirror; and an eccentricity calculator for calculating an output, at a detection of the second reflection light by the photo detecting element, from the optical position detecting element. The second measuring light forms a given angle with the second reflection light, and a plane formed by the first measuring light and the first reflection light intersects with a plane formed by the second measuring light and the second reflection light at right angles.

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